Transformer fire burns for hours at Hunterstown generating station

A transformer at the Hunterstown Generating Station, operated and owned by LS Power, in Straban Township, Adams County, Pennsylvania, caught fire early on Thursday, 2 July 2026, sending thick black smoke over the area for hours during an extreme heat warning. Fire crews and emergency personnel from five counties across Pennsylvania and Maryland responded, including foam liquid carriers, an engine tanker, ambulances and hazardous materials support. The plant was evacuated around 10:10 a.m. as a precaution, though no evacuation was ordered for nearby residents and no shelter-in-place order was issued. By Thursday afternoon crews shifted from actively fighting the fire to allowing the mineral oil in the transformer to burn off within its firewall and containment structure. No injuries were reported. The regional grid operator said electricity reliability was not affected because sufficient backup resources were available.

The official cause of the fire had not been determined and the investigation was ongoing. The incident occurred during a regional extreme heat warning with elevated electricity demand, though sources did not state that heat contributed to the transformer failure.

1. Transformer fires involving mineral oil may require a shift from active suppression to controlled burn-off within firewall and containment structures once initial risk is managed.
2. Large transformer fires at generating stations can require mutual aid from multiple counties and even neighbouring states, including specialised foam and hazardous materials units.
3. Grid operators should maintain sufficient backup capacity so that the loss of a single transformer during high-demand heat events does not compromise regional reliability.

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